Connect this Ezviz Open/Close door sensor wirelessly to the Ezviz Gateway and secure your house in a smart way. You can also easily connect all your sensors to your smart home. You can easily install this sensor on the doorframe, thanks to the adhesive edge. In the app, you can check how long the door has been open. You can also set a notification for when the door is open for 2 minutes, for example. The battery lasts up to 2 years. The sensor notifies you if someone wants to remove it. This sensor doesn't work as alarm on its own, you need to connect it to an Ezviz Gateway.